Bone Navigation Using Instrument-Mounted Markers With Re-Registration
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Solution Overview
Problem
The use of dedicated marker devices rigidly affixed to body structures, such as bones, during medical navigation causes additional damage and negatively impacts surgical efficiency and accuracy.
Innovation Solution
A method that utilizes a marker device affixed to a medical instrument, which is then rigidly affixed to the body structure, eliminating the need for a dedicated marker device on the body structure by calculating positional relationships using bone registration and reregistration data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated marker device is rigidly affixed to a bone using pins, bolts or Schanz screws, then the marker device can be detected by the medical navigation system, but additional holes are imposed on the bone causing damage
Solution Approach 1:
The patent combines the marker device function with the medical instrument by affixing the marker to the instrument itself. This merging eliminates the need for separate dedicated marker devices on the bone, thereby avoiding additional bone damage while maintaining navigation detection capability through the instrument-mounted marker.
Solution Approach 2:
The medical instrument is given multiple functions: it serves both as the surgical tool and as the carrier for the navigation marker. This multi-functionality allows the system to eliminate dedicated marker devices while maintaining accurate positional tracking throughout the surgical procedure.
2Measurement precision
If a dedicated marker device is rigidly affixed to the bone, then the position can be tracked accurately, but the surgical efficiency is reduced due to additional setup time and invasiveness
Solution Approach 1:
By merging the marker device with the medical instrument, the patent eliminates separate affixing steps and reduces setup time. The instrument-mounted marker is positioned and tracked as part of the normal surgical workflow, improving efficiency while maintaining measurement precision through continuous positional tracking.
Solution Approach 2:
The marker is pre-attached to the medical instrument before the surgical procedure begins. This preliminary action eliminates the need for intraoperative marker installation, reducing surgical setup time and improving overall surgical efficiency while ensuring accurate position tracking from the start of the procedure.
3Loss of information
If a dedicated marker device is used on the bone, then navigation data can be obtained, but the complexity of the surgical procedure increases
Solution Approach 1:
The patent merges the marker device with the medical instrument, reducing the number of separate components and steps required. This simplification maintains full navigation data availability while reducing procedural complexity by eliminating dedicated marker installation, adjustment, and removal steps.
Solution Approach 2:
The patent extracts the dedicated marker device from the bone and relocates it to the medical instrument. This extraction simplifies the surgical procedure by removing unnecessary steps while preserving all essential navigation data through the instrument-mounted marker system.
Data Source
AI summary
A method for providing positional relationship data, which represent the position of a marker device relative to a bone which it is affixed to, to a medical navigation system, including receiving bone registration data which represent locations of points on the surface of the bone, calculating, from the bone registration data, the current relative position between the bone and a medical instrument which bears the marker device, determining an offset between the current relative position and a desired relative position; outputting indication information which is based on the calculated offset, receiving bone re-registration data which represent locations of points on the surface of the bone, and calculating the positional relationship data from the bone re-registration data.